57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <folly/concurrency/UnboundedQueue.h>
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#include <folly/executors/task_queue/BlockingQueue.h>
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#include <folly/synchronization/LifoSem.h>
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namespace folly {
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template <class T>
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class UnboundedBlockingQueue : public BlockingQueue<T> {
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public:
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virtual ~UnboundedBlockingQueue() {}
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BlockingQueueAddResult add(T item) override {
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queue_.enqueue(std::move(item));
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return sem_.post();
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}
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T take() override {
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sem_.wait();
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return queue_.dequeue();
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}
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folly::Optional<T> try_take_for(std::chrono::milliseconds time) override {
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if (!sem_.try_wait_for(time)) {
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return folly::none;
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}
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return queue_.dequeue();
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}
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size_t size() override {
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return queue_.size();
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}
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private:
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LifoSem sem_;
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UMPMCQueue<T, false, 6> queue_;
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};
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} // namespace folly
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